2 * Copyright (C) 2012 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 package com.android.server.display;
19 import android.content.Context;
20 import android.os.Handler;
21 import android.view.Display;
23 import java.io.PrintWriter;
24 import java.util.concurrent.atomic.AtomicInteger;
27 * A display adapter makes zero or more display devices available to the system
28 * and provides facilities for discovering when displays are connected or disconnected.
30 * For now, all display adapters are registered in the system server but
31 * in principle it could be done from other processes.
33 * Display adapters are guarded by the {@link DisplayManagerService.SyncRoot} lock.
36 abstract class DisplayAdapter {
37 private final DisplayManagerService.SyncRoot mSyncRoot;
38 private final Context mContext;
39 private final Handler mHandler;
40 private final Listener mListener;
41 private final String mName;
43 public static final int DISPLAY_DEVICE_EVENT_ADDED = 1;
44 public static final int DISPLAY_DEVICE_EVENT_CHANGED = 2;
45 public static final int DISPLAY_DEVICE_EVENT_REMOVED = 3;
48 * Used to generate globally unique display mode ids.
50 private static final AtomicInteger NEXT_DISPLAY_MODE_ID = new AtomicInteger(1); // 0 = no mode.
53 * Used to generate globally unique color transform ids.
55 * Valid IDs start at 1 with 0 as the sentinel value for the default mode.
57 private static final AtomicInteger NEXT_COLOR_TRANSFORM_ID = new AtomicInteger(1);
59 // Called with SyncRoot lock held.
60 public DisplayAdapter(DisplayManagerService.SyncRoot syncRoot,
61 Context context, Handler handler, Listener listener, String name) {
70 * Gets the object that the display adapter should synchronize on when handling
71 * calls that come in from outside of the display manager service.
73 public final DisplayManagerService.SyncRoot getSyncRoot() {
78 * Gets the display adapter's context.
80 public final Context getContext() {
85 * Gets a handler that the display adapter may use to post asynchronous messages.
87 public final Handler getHandler() {
92 * Gets the display adapter name for debugging purposes.
94 public final String getName() {
99 * Registers the display adapter with the display manager.
101 * The display adapter should register any built-in display devices as soon as possible.
102 * The boot process will wait for the default display to be registered.
103 * Other display devices can be registered dynamically later.
105 public void registerLocked() {
109 * Dumps the local state of the display adapter.
111 public void dumpLocked(PrintWriter pw) {
115 * Sends a display device event to the display adapter listener asynchronously.
117 protected final void sendDisplayDeviceEventLocked(
118 final DisplayDevice device, final int event) {
119 mHandler.post(new Runnable() {
122 mListener.onDisplayDeviceEvent(device, event);
128 * Sends a request to perform traversals.
130 protected final void sendTraversalRequestLocked() {
131 mHandler.post(new Runnable() {
134 mListener.onTraversalRequested();
139 public static Display.Mode createMode(int width, int height, float refreshRate) {
140 return new Display.Mode(
141 NEXT_DISPLAY_MODE_ID.getAndIncrement(), width, height, refreshRate);
144 public static Display.ColorTransform createColorTransform(int colorTransform) {
145 return new Display.ColorTransform(
146 NEXT_COLOR_TRANSFORM_ID.getAndIncrement(), colorTransform);
149 public interface Listener {
150 public void onDisplayDeviceEvent(DisplayDevice device, int event);
151 public void onTraversalRequested();